He was sweating and his muscles were tired and it made Aragorn smile. He had missed this sort of challenge and he was now looking more forward to the fight night. While he wasn't particularly prone to violence, violence always found him and he needed to be ready. Being able to move made him feel good.
"Many of these moments with someone close to me back home who is far more skilled with a sword than I." Or maybe Aragorn was biased, but he thought Arwen very capable. "Thank you for the challenge. I have missed it."